IMPACT: International Journal of Research in Engineering & Technology (IMPACT: IJRET) ISSN(E): 2321-8843; ISSN(P): 2347-4599 Vol. 2, Issue 9, Sep 2014, 45-50 © Impact Journals
DURABILITY STUDY OF SELF-COMPACTING CONCRETE USING MANUFACTURED SAND DEEPTHY RAJAGOPAL1 & MATHEWS M PAUL2 1 2
Post- Graduate Scholar, Mar Athanasius College of Engineering, Kothamangalam, Kerala, India
Professor, Department of Civil Engineering, Mar Athanasius College of Engineering, Kothamangalam, Kerala, India
ABSTRACT Self-Compacting Concrete (SCC) is an innovative concrete that does not require vibration for placing and compaction. Self-Compacting Concrete is extensively applied in many construction projects due to its excellent fresh and hardened properties. In this study M35 mix is used. Master Glenium Sky 8233 is used as the chemical admixture. The main aim of the project is to design the mix using fly ash as additive. Then sulphate attack and chloride attack of the specimens were determined. Different proportions of solution are used for durability study.
KEYWORDS: Self-Compacting Concrete, Durability, Fresh Properties, Hardened Properties INTRODUCTION Concrete technology has made tremendous strides in the past decade. The development of specifying a concrete according to its performance requirements, rather than the constituents and ingredients has opened innumerable opportunities for producers of concrete and users to design concrete to suit their specific requirements. One of the most outstanding advances in the concrete technology over the last decade is “Self Compacting Concrete” (SCC). Self Compacting Concrete is an innovative concrete that does not require vibration for placing and compaction. It is able to flow under its own weight, completely filling formwork and achieving full compaction, even in the presence of congested reinforcement. The improved construction practice and performance, combined with the health and safety benefits, make self compacting concrete a very attractive solution for civil engineering construction. In this study, a mix was designed using fly ash as additive. Using this mix cubes were casted and sulphate and chloride attack were determined. Also fresh and hardened properties of SCC were determined. The fresh properties were determined by Slump flow, V-funnel and L-Box test.
EXPERIMENTAL INVESTIGATIONS Materials Grade-53 Ordinary Portland Cement was used. Manufactured sand was used as fine aggregate. Blended aggregate of size 12.5mm and 6mm were used as coarse aggregate. Specific gravity of fly ash used was 2.1. Master Glenium Sky 8233 was used as super plasticizer. The various properties of fine and coarse aggregate was shown in Table 1 and Table 2.
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Deepthy RajaGopal & Mathews M Paul
Table 1: Physical Properties of Coarse Aggregate Properties Specific Gravity
Values 2.72
Table 2: Physical Properties of Fine Aggregate Properties Specific Gravity Fineness Modulus
Values 2.65 3.12
Mix Proportion Table 3 presents the quantities of ingredients required for one cubic meter of SCC. Table 3: Mix Proportion for 1m3 SCC Cement 376 Kg
Fine Aggregate 514.14 Kg
Coarse Aggregate 649.9 Kg
Fly Ash 505.7 Kg
Water 203 l
Admixture 6 Kg
Tests on Fresh Properties of Concrete In order to study the fresh properties of SCC various tests were done like Slump flow, T500, L-box test and V-funnel test. The values obtained doing this test were tabulated in Table 4 and it conform to the range of SCC. Table 4: Fresh Properties of Concrete Slump (mm) 720
T500 (s) 1.9
Passing Ratio 0.98
V-Funnel (s) 24
Durability Study Its ability to resist weathering action, chemical attack, abrasion or any other process of deterioration. In order to study the durability charecteristics, that is, the sulphate attack and chloride attack the SCC cubes were immersed in sodium chloride and Magnesium sulphate solutions. The cubes were demoulded and dipped in the respective solutions. Then the cubes were taken from the solutions after 7, 14, 28, 56, 90 days and their corresponding compressive strengths were noted. Sodium chloride solution of three different strengths were used. Salt content of soil is 0.5M so 0.25, 0.5 and 0.75M was used. Similarly Magnesium sulphate solution was also of three different strengths. They are 4% MgSO4, 5% MgSO4, 6% MgSO4 were used.
RESULTS AND DISCUSSIONS The compressive strength values of specimen immersed in chloride and sulphate solution were tabulated in Table 5 and Table 6. From the result we can seen that the compressive strength of the specimen decreases as the strength of the solution increases. Table 5: Compressive Strength of Cube Immersed in Chloride Solution Solution Control Concrete(water curing) NaCl 0.25M NaCl 0.5M NaCl 0.75M
Average Compressive Strength (MPa) 7th Day 14th Day 28th Day 56th Day 46.65 54.51 67.70 69.18 43.55 50.51 60.40 61.23 40.42 46.82 56.21 57.30 37.32 43.21 52.32 53.02
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Durability Study of Self-Compacting Concrete Using Manufactured Sand
Figure 1: Percentage Reduction in Compressive Strength of Cube Immersed in NaCl with Respect to Strength of NaCl Solution (Molar)
Figure 2: Percentage Reduction in Compressive Strength of Cube Immersed in NaCl with Respect to Duration
Table 6: Compressive Strength of Cube Immersed in Sulphate Solution Solution Control Concrete (water curing) 4% MgSO4 5% MgSO4 6% MgSO4
Average Compressive Strength (MPa) 7th Day 14th Day 28th Day 56th Day 46.65 54.51 67.70 69.18 45.46 51.56 60.00 60.89 43.56 49.16 58.20 57.24 42.52 47.26 56.80 55.45
Figure 3: Percentage Reduction in Compressive Strength of Cube Immersed in MgSO4 with Respect to Strength of MgSO4 Solution (Percentage)
Figure 5: Weight Loss (in %) of Cube Immersed in Sodium Chloride Solution
Figure 4: Percentage Reduction in Compressive Strength of Cube Immersed in MgSO4 with Respect to Duration
Figure 6: Weight Loss (in %) of Cube Immersed in Magnesium Sulphate Solution
CONCLUSIONS Based on the results presented in this paper, the following conclusions can be drawn:
•
The various properties of the mix such as slump flow +T500, filling ability, passing ability etc are verified and its
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Deepthy RajaGopal & Mathews M Paul
meets the European standard of SCC. So the use of SCC using M-sand developed is recommended according to the European guide lines.
•
The compressive strength of cubes immersed in sodium chloride solution decreases as the strength of the solution increases.
•
The compressive strength of cubes immersed in magnesium sulphate solution decreases as the strength of the solution increases
•
The weight loss of the specimen immersed in sulphate and chloride solution increases as exposure day increases. This is due to deterioration of concrete
ACKNOWLEDGEMENTS The author would like to thank all persons who ensured the good running of experiments in the laboratory of construction materials.
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Index Copernicus Value: 3.0 - Articles can be sent to editor@impactjournals.us
Durability Study of Self-Compacting Concrete Using Manufactured Sand
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